Grinding machine



FIG. 1 is a perspective view of a grinding machine, showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a right side elevational view thereof; and,

FIG. 8 is a perspective view with the cover in an open position.

The broken line showing of the abrasive grinding mesh is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a grinding machine, as shown and described. 